---- tenera, viii, 97.^f ---- tenuiflora, xxxix, 51. ---- teretiuscula, vii, 265. ---- tentaculata, x, 34. ---- tetanica, xi, 312.^f ---- Torreyana, x, 47. ---- Torreyi, xlix, 43.^f ---- triceps, xlviii, 142.^f ---- trichocarpa, vii, 274; xi, 158.^f ---- trisperma, ix, 63.^f ---- Tuckermanii, xlix, 48.^f ---- umbellata, x, 31^f; xi, 316. ---- ursina, xxvii, 240.^f ---- ustulata, xi, 149. ---- Vahlii, xxvi, 377. ---- varia, xi, 162. ---- venusta, xxvi, 107.^f ---- verna, xi, 314. ---- verrucosa, xi, 159^f; xlviii, 140.^f ---- vesicaria, x, 273. ---- vestita, ix, 261. ---- virescens, ix, 259. ---- viridula, xi, 153. ---- Washingtoniana, x, 272^f; xii, 296. ---- Willdenovii, ix, 258; xi, 311. ---- Wormskioldiana, xi, 154; xiv, 352.^f ---- xanthophysa, vii, 274^f; xiv, 353. ---- ---- β nana, 353.^f ---- ---- γ minor, 353.^f Catalpa syringifolia, x, 259. Cerastium, _n. sp._, iv. 63. Cerotiola ericoides, northern limit of, _H. B. Croom_, xxvi, 315. Cetraria Tuckermanii, xlv, 48. Chamœrops palmetto, locality of, xxvi, 315. Charæ of North America, by _A. Braun_, xlvi, 92. Clematis reticulata, xiv, 115. Corydalis formosa, and canadensis, xxvi, 114.^f Cranichis multiflora, v, 302. Craterium pyriforme, _J. W. Bailey_, xlii, 195. ---- ----, shown to be an Acarus, xliii, 205.^f Cryptogamia of Chelmsford, notice of a memoir on, by _J. L. Russel_, xxxix, 183. Cuscuta cephalanthi, xliii, 336^f; xiv, 73. ---- coryli, xliii, 337^f; xlv, 73. ---- hispidula, xlv, 75. ---- neuropetala, xlv, 75. ---- pentagona, xliii, 340^f; xlv, 76. ---- polygonorum, xliii, 342^f; xlv, 76. ---- saururi, xliii, 339^f; xlv, 74. ---- verrucosa, xliii, 341^f; xlv, 74. ---- vulgivaga, xliii, 338^f; xlv, 73. Cuscutineæ, N. American, monograph of, _G. Engelmann_, xliii, 333; xlv, 73. Cycadeæ, remarks on, with descriptions of the ovula and seeds of Cycas revoluta, by _A. J. Downing_, xxxii, 45.^f Cylactis, i, 377. Cynanchum scoparium, v, 291. Cyrilla paniculata, v, 290. Dalea violacea, iv, 66. Datura, two species in the United States, vi, 254. Delphinium tricome, xiv, 114. Dentaria dissecta, vii, 62. Diervilla sessilifolia, xlv, 174. Dionæa muscipula, xxvi, 315. Diphylleia cymosa, xlii, 23. Diplocea barbata, i, 252. Dracena borealis, iv, 61. Eleocharis compressa, xlii, 50. Elymus hystrix, iv, 58. Equiseta, North American, _A. Braun's_ monograph, with additions by _G. Engelmann_, xlvi, 81.